122 ROMER’S DESCRIPTION OF THE CHALK 
The lower masses here contain Cardiwm Hillanum, Pecten equi- 
costatus, Pinna decussata, and therefore evidently belong to the 
quader sandstone (lower greensand); while the upper, likewise a 
very massive sandstone, has never been found to contain those 
fossils, but, on the contrary, Terebratula alata,—a fossil which is 
peculiar to the upper chalk ; and we therefore consider all those 
masses of sandstone in Saxony, which rest upon the marly mass 
here described, to be equivalent to the white chalk with flints. 
We have distinctly recognised this sandstone above the marl, so 
abundant in springs, close to Pirna, in the valley of the Gott- 
laube, near Rottwernsdorf and Kritzschwitz, and at several 
places at the foot of the Schneeberg. The Saxon geologists 
look upon it as the English gault; but the characters of the 
stone oppose this view ; and the stratigraphical relations are not 
in favour of it, since the upper greensand (for which they take 
the pure sandstones above the marl) never attain such a height, 
never contain Terebratula alata, and almost always appear to 
be very argillaceous, and to abound in lime and iron. Hitherto 
it has been impossible to determine, in the collections of fossils 
of that neighbourhood, which species have been found in the 
upper and which in the lower of these beds of marl; but when- 
ever this can be ascertained, it will probably be easy to decide 
which of the two views is the more correct. 
Still further towards the east a similar equivalent to the white 
chalk with flints occurs, in the county Glatz, near Kieslings- 
walde, where it appears as a dark gray calcareous sandstone, 
abounding in minute laminz of mica, and passing, by the recep- 
tion of small pebbles of flint, into a true conglomerate; nume- 
rous fossils occur in it, partly as fragments, but some very well 
preserved. 
Quite at the western extremity of our district we meet with 
the upper chalk-marl, near Aix la Chapelle at Louisberg, and 
in the so-called Aachener Wald. The following section is ex- 
posed at the first of these places. 
SecTIoNn AT THE LoUISBERG NEAR AIX LA CHAPELLE. 
Feet*. 
1. A calcareous yellow sand containing Mososaurus, 
fishes’ teeth, Belemnites mucronatus; which Hausmann 
has justly compared to the formation at Maestricht . 4 
* The German measures probably employed in the paper are so little dif- 
ferent from those of England, that it has not been thought necessary to con- 
